Pixel driving circuit and driving method thereof, and display device

Abstract

The present invention provides a pixel driving circuit and a driving method thereof, and a display device. The pixel driving circuit is used for driving a pixel array, wherein each pixel in the pixel array comprises four sub-pixels with different colors, and wherein the pixel driving circuit comprises: at least one first sub-pixel driving chip and at least one second sub-pixel driving chip, wherein the at least one first sub-pixel driving chip each is connected to a part of sub-pixels corresponding thereto in corresponding pixels to drive them, and the at least one second sub-pixel driving chip each is connected to the other part of sub-pixels corresponding thereto in the corresponding pixels to drive them. In the invention, noise interference can be avoided, and the display quality is improved; the cost is reduced; signal transmitting efficiency is increased and the EMI characteristic of products is improved.

Description

FIELD OF THE INVENTION[0001]The present invention relates to the field of display technology, and particularly relates to a pixel driving circuit and a driving method thereof, and a display device.BACKGROUND OF THE INVENTION[0002]Design of modules of a display device adopting Active Matrix / Organic Light Emitting Diode (AMOLED) is quite complicated, and when a resolution of the display device is increased to more than 3840×2160 (large-size display), a design of four sub-pixels with different colors (that is, Red, Green, Blue and White, RGBW for short) is generally adopted. For the design of four sub-pixels with different colors, a gate / source double-driving method is generally used. FIG. 1 shows a schematic diagram of a driving circuit for four sub-pixels with different colors in the prior art, as shown in FIG. 1, the pixel driving circuit in the prior art comprises: a first driving circuit board, a second driving circuit board and a pixel array, wherein the first driving circuit boa...

AI Technical Summary

Benefits of technology

The present invention provides a pixel driving circuit and a driving method thereof, which uses a source single-driving method to reduce the used pins of the sub-pixel driving chip, resulting in improved display quality, reduced number of Gamma voltage supplies, decreased number of sub-pixel driving chips, and reduced cost and size of display device. Additionally, the reduced number of Gamma voltage supplies avoids large amounts of noise and improves the EMI characteristic of products. Overall, the invention improves the overall performance of the display device.

Problems solved by technology

Since signal lines for Gamma voltage supplies are exposed outside, large number of Gamma voltage supplies may result in large amount of noise, which may affect the display quality.

In addition, the sub-pixel driving chip is expensive in cost, use of its pins should be saved as far as possible.

Also, the pixel driving circuit in the prior art will use a large number of sub-pixel driving chips to satisfy requirements on pins, thus too many devices may result in a large-sized display device, and it is difficult to meet the requirements on thin and compact design of display device.

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